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Business Combinations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 28, 2025
Sep. 24, 2025
Dec. 29, 2024
Sep. 30, 2024
Sep. 28, 2025
Sep. 29, 2024
Sep. 28, 2025
Sep. 29, 2024
Dec. 31, 2024
Dec. 29, 2024
Dec. 31, 2023
Business Combinations [Line Items]                      
Net of cash acquired             $ 20,689 $ 53,500  
Costs of goods $ 2,200                    
Principal amount   $ 20,000                  
Trading day   30 days                  
Business days   2 days                  
Accrued expenses and other current liabilities 4,499   $ 8,628   $ 4,499   4,499     $ 8,628  
Other long-term liabilities 12,869   8,553   12,869   12,869     8,553
Before income taxes         (15,804) $ (77,958) (30,099) (101,422)   (54,444) (96,217)
Revenue         70,005 [1] 5,536 [1] 220,269 [1] 20,068 [1]   108,742 87,616
Net income         (16,904) (77,958) (31,199) (103,440) $ (56,451) (56,451) (269,555)
General and Administrative Expense [Member]                      
Business Combinations [Line Items]                      
Acquisition cost     $ 7,200             7,200  
Sunder Energy Acquisition [Member]                      
Business Combinations [Line Items]                      
Contributed revenue 4,300                    
Before income taxes 300                    
SunPower Acquisition [Member]                      
Business Combinations [Line Items]                      
Aggregate cash consideration       $ 54,500              
Net of cash acquired       1,000              
Net of cash acquired   $ 20,700   1,000              
Payment of aggregate consideration       $ 54,500              
Revenue                   (83,800)  
Net income                   (6,500)  
Sunder Energy Acquisition [Member]                      
Business Combinations [Line Items]                      
Aggregate cash consideration   $ 57,800                  
Common stock to be issued (in Shares)   3,333,334                  
Additional paid-in capital 5,700       5,700   5,700        
Accrued expenses and other current liabilities 5,700       5,700   5,700        
Other long-term liabilities $ 5,700       5,700   5,700        
12-Month Anniversary [Member]                      
Business Combinations [Line Items]                      
Common stock to be issued (in Shares)   3,333,333                  
18-Month Anniversary [Member]                      
Business Combinations [Line Items]                      
Common stock to be issued (in Shares)   3,333,333                  
3 Month Anniversary [Member]                      
Business Combinations [Line Items]                      
Deferred consideration percentage   50.00%                  
6 Month Anniversary [Member]                      
Business Combinations [Line Items]                      
Deferred consideration percentage   50.00%                  
Common Stock [Member] | Sunder Energy Acquisition [Member]                      
Business Combinations [Line Items]                      
Common stock to be issued (in Shares)   10,000,000                  
Common Stock [Member]                      
Business Combinations [Line Items]                      
Price per share (in Dollars per share)   $ 1.71                  
Common stock of acquisition   $ 17,100                  
Net income          
[1] Revenue is net of dealer fees attributable to related party of $0.3 million and $1.6 million in the thirteen and thirty-nine week periods ended September 28, 2025, respectively. Revenue is net of dealer fees attributable to related party of $1.6 million in each of the thirteen and thirty-nine week periods ended September 29, 2024. Refer to Note 16 – Related Party Transactions for details.